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Long Division

The Hook

Does McDonald's Sell Cheese Burgers?

What is it?

The step-by-step process for dividing large numbers.

Time Travel (History)

The notation we use today was popularized in the 1700s.

Cheat Code

DMSCB: Divide, Multiply, Subtract, Check, Bring down.

Practice This Now!

The Field Guide

In Plain English: When numbers are too big to divide mentally, we break them into chunks. We divide the Hundreds, then the Tens, then the Ones. It's a loop you repeat until you run out of numbers.

In The Real World: Calculating miles per gallon on a road trip (450 miles / 12 gallons).

How To Do It

  1. Divide (How many times does it fit?)
  2. Multiply (Number on top x Divisor)
  3. Subtract (Remainder)
  4. Check (Is remainder smaller than divisor?)
  5. Bring Down (Next digit)

Booby Trap!

Forgetting to 'Bring Down' the next number after subtracting.

Real World Challenge
"A lottery prize of $840 is split among 4 winners."
The Logic: 840 รท 4. 4 into 8 is 2. 4 into 4 is 1. 4 into 0 is 0. Each gets $210.

Training Drills

The Setup
21 ___ 4| 84 -8 -- 04 -4 0
Zero remainder. Perfect division.